Verification of Superpave Number of Design Gyration Compaction Levels for Georgia
| Autor: | David Mark Jared, Jason R Moore, Justin Heartsill, Donald E Watson, Peter Y Wu |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Transportation Research Record: Journal of the Transportation Research Board. 2057:75-82 |
| ISSN: | 2169-4052 0361-1981 |
| DOI: | 10.3141/2057-09 |
| Popis: | The objective of this project was to evaluate the performance of Georgia's mixes designed by using the Superpave® gyratory compactor. Mixes designed with numbers of design gyrations that are too high would be rut resistant but may be difficult to compact adequately in the field and may lack sufficient durability because of reduced asphalt binder content. The following conclusions were made on the basis of an evaluation of field projects and from laboratory volumetric and performance testing with various aggregate sources and gyration levels: (a) It is unlikely that Superpave mixtures will reach the design air voids of 4.0% during the life of the pavement. After nearly 5 years, the average air voids measured in the wheelpaths were 5.7% for Superpave projects and 3.8% for Marshall projects. On the basis of volumetric comparisons, 66 gyrations with the laboratory-produced mix gave approximately the same density achieved on the Superpave projects in the field. (b) The difference between 4-in.-diameter Marshall samples and 6-in.-diameter gyratory samples for moisture susceptibility was not statistically significant enough to assign a relationship between the tensile strength ratio (TSR) for samples with a diameter of 4 in. and the TSR for samples with a diameter of 6 in. (c) Although the asphalt binder content was an important factor in extending fatigue life, aggregate source and strain level were the most significant variables affecting fatigue results. |
| Databáze: | OpenAIRE |
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